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Middlehaven Urban Park

Case Study 

Contract In Brief:  
Location: Client: Consulting Engineers:
Middlesbrough CA Blackwell Contracts CH2M
HBR Role: Form of Contract: Contract Period:
Specialist Remediation Contractor
8 Months
Contract Value: Contract Start:
£0.5M May 2014
HBR Site Management    
Contracts Manager: Project Manager: Technical Manager:
John Harrison/Denis Green Russell Deacon  Simon Hockin
Services Included:           
In-situ soils & groundwater ü DQRA & Regulatory Liaison                   ü Stabilisation/solidification                ü
Complex screening ü Complex Sorting ü Geotechnical improvement ü

Project Summary:

 

HBR were employed by CA Blackwell Contracts (CAB) to undertake the
remediation works at the Middlehaven Urban Park in Middlesborough. The
project involved large scale earth moving and excavation works (undertaken
by CAB) of former gasworks structures and associated contamination as well
as part of the site which formerly housed a foundry/iron works. The remit of
HBR was to manage and treat the contaminated soils and groundwater using
suitable techniques to achieve the remedial objectives. The contaminants
identified included heavy metals, cyanide, petroleum hydrocarbons and poly
aromatic hydrocarbons, including particularly high levels of Naphthalene.

HBR were employed by CA Blackwell Contracts (CAB) to undertake theremediation works at the Middlehaven Urban Park in Middlesborough. Theproject involved large scale earth moving and excavation works (undertakenby CAB) of former gasworks structures and associated contamination as wellas part of the site which formerly housed a foundry/iron works. The remit ofHBR was to manage and treat the contaminated soils and groundwater usingsuitable techniques to achieve the remedial objectives. The contaminantsidentified included heavy metals, cyanide, petroleum hydrocarbons and polyaromatic hydrocarbons, including particularly high levels of Naphthalene.

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Soils from excavations were screened and tested for contaminant levels against the reuse criteria, which were derived by the DQRA produced by HBR. Soils that did not meet this criteria were stockpiled for treatment. The treatment methods used were stabilisation/solidification (for metals impacted soils) and bioremediation (for hydrocarbon impacted soils). Treatment solutions were chosen based on the required end point criteria as compared to baseline data, using a BATNEEC assessment.

The bioremediation process involved the homogenisation of soils using screening and homogenising plant. Various amendments were then applied to aid the bioremediation process. Soils were then placed in windrows and regularly turned. The treatment period was between 6 and 8 weeks, after which time the soils were again tested to ensure that the remedial targets had been achieved.

Soils that were contaminated with heavy metals were subjected to treatment using stabilisation techniques. The additives varied depending on contaminants and concentrations, incorporating binders and fixing agents.

The process demobilised contaminants and minimising leachability from the soilsmatrix. HBR also undertook the treatment of tar impacted groundwater via system of oil/water separators and sand/carbon filters. In the region of 40 cubic metres of tar were recovered throughout the project.

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                 Chemical v Physical v Biologicalv Complex Sorting v Water Treatmentsv Complimentary Processes